#ifndef __MY_UTIL__
#define __MY_UTIL__
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <experimental/filesystem>
#include <sys/stat.h>
#include <jsoncpp/json/json.h>
#include <memory>
#include "bundle.h"

namespace cloud
{
    namespace fs = std::experimental::filesystem;
    class FileUtil
    {
    private:
        std::string _filename;

    public:
        FileUtil(const std::string &filename)
            : _filename(filename)
        {
        }
        bool Remove()
        {
            if (this->Exists() == false)
            {
                return true;
            }
            remove(_filename.c_str());
            return true;
        }
        int64_t Filesize()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get file size failed!\n";
                return 0;
            }
            return st.st_size;
        }
        time_t LastMTime()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get file modify time failed!\n";
                return -1;
            }
            return st.st_mtime;
        }
        time_t LastATime()
        {
            struct stat st;
            if (stat(_filename.c_str(), &st) < 0)
            {
                std::cout << "get accent time failed!\n";
                return -1;
            }
            return st.st_atime;
        }
        std::string FileName()
        {
            // ./abc/test.txt
            size_t pos = _filename.find_last_of("//");
            if (pos == std::string::npos)
            {
                return _filename;
            }
            return _filename.substr(pos + 1);
        }
        // 输入型参数
        bool GetPosLen(std::string *body, size_t pos, size_t len)
        {
            size_t fsize = this->Filesize();
            if (pos + len > fsize)
            {
                std::cout << "get file size error!\n";
                return false;
            }
            std::ifstream ifs;
            ifs.open(_filename, std::ios::binary);
            if (ifs.is_open() == false)
            {
                std::cout << "read file open failed!\n";
                return false;
            }
            ifs.seekg(pos, std::ios::beg);
            body->resize(len);
            ifs.read(&(*body)[0], len);
            if (ifs.good() == false)
            {
                std::cout << "get file content failed!\n";
                ifs.close();
                return false;
            }
            ifs.close();
            return true;
        }
        bool GetContent(std::string *body)
        {
            size_t fsize = this->Filesize();
            return GetPosLen(body, 0, fsize);
        }
        // 输入型参数
        bool SetContent(const std::string &body)
        {
            std::ofstream ofs;
            ofs.open(_filename, std::ios::binary);
            if (ofs.is_open() == false)
            {
                std::cout << "write file open failed!\n";
                return false;
            }

            ofs.write(&body[0], body.size());
            if (ofs.good() == false)
            {
                std::cout << "set file content failed!\n";
                ofs.close();
                return false;
            }
            ofs.close();
            return true;
        }
        bool Exists()
        {
            return fs::exists(_filename);
        }
        bool CreateDirectory()
        {
            if (this->Exists())
                return true;
            return fs::create_directories(_filename);
        }
        bool ScanDirectory(std::vector<std::string> *arry)
        {
            this->CreateDirectory();
            for (auto &f : fs::directory_iterator(_filename))
            {
                if (fs::is_directory(f) == true)
                    continue;

                // relative_path 带有路径的文件名
                arry->push_back(fs::path(f).relative_path().string());
            }
            return true;
        }
        // 压缩文件
        bool Compress(const std::string &packname)
        {
            // 1.获取源文件的数据
            std::string body;
            if (this->GetContent(&body) == false)
            {
                std::cout << "compress file get packed content failed!\n";
                return false;
            }

            // 2.将数据进行压缩
            std::string packed = bundle::pack(bundle::LZIP, body);

            // 3. 将压缩的数据存储到压缩包文件中
            FileUtil fu(packname);
            if (fu.SetContent(body) == false)
            {
                std::cout << "compress write packed data failed!\n";
                return false;
            }
            return true;
        }
        // 解压缩文件
        bool UnCompress(const std::string &filename)
        {
            // 1.将压缩包的数据读取出来
            std::string body;
            if (this->GetContent(&body) == false)
            {
                std::cout << "uncompress get file unpacked content failed!\n";
                return false;
            }

            // 2.将数据进行解压缩
            std::string unpacked = bundle::unpack(body);

            // 3.将解压缩后的数据写入文件夹
            FileUtil fu(filename);
            if (fu.SetContent(body) == false)
            {
                std::cout << "uncompress write unpacked data failed!\n";
                return false;
            }
            return true;
        }
    };

    class JsonUtil
    {
    public:
        static bool Serialize(const Json::Value &root, std::string *str)
        {
            Json::StreamWriterBuilder swb;
            std::unique_ptr<Json::StreamWriter> sw(swb.newStreamWriter());
            std::stringstream ss;
            if (sw->write(root, &ss) != 0)
            {
                std::cout << "json write failed!\n";
                return false;
            }
            *str = ss.str();
            return true;
        }
        static bool UnSerialize(const std::string &str, Json::Value *root)
        {
            Json::CharReaderBuilder crb;
            std::unique_ptr<Json::CharReader> cr(crb.newCharReader());
            std::string err;
            bool ret = cr->parse(str.c_str(), str.c_str() + str.size(), root, &err);
            if (ret == false)
            {
                std::cout << "parse error: " << err << std::endl;
                return false;
            }
            return true;
        }
    };
}
#endif